Journal of Neuroscience, Vol 11, 1224-1230, Copyright © 1991 by Society for Neuroscience
Antiserum from a patient with cerebellar degeneration identifies a novel protein in Purkinje cells, cortical neurons, and neuroectodermal tumors
RB Darnell, HM Furneaux and JB Posner
Department of Neurology, Memorial Sloan-Kettering Cancer Center, New York, New York 10021.
The serum and cerebrospinal fluid of a patient (NB) with subacute
cerebellar degeneration were found to contain a novel antineuronal
autoantibody (anti-Nb). Using this antibody, we have identified and
characterized antigens present in a subset of neurons in the CNS and in
some neuroectodermal tumor lines. Anti-Nb antibody bound to antigens of Mr
150, 120, and 65 kDa in Western blots using extracts of human cerebellar
Purkinje cells or human cerebral cortical neurons. Immunohistochemistry
demonstrated relatively specific binding of anti- Nb IgG to Purkinje cells
in sections of human cerebellum and to some neocortical neurons, especially
those in layer VI. Because of the association of cerebellar degeneration
with occult malignancies, we screened a number of tumor cell lines for
immunoreactivity to anti-Nb antibody; only tumor lines of neuroectodermal
origin (melanoma, small- cell lung cancer, and neuroblastoma) expressed the
Nb antigen. Anti-Nb antibody thus identifies neuronal and tumor cell
antigens that appear to be unique in size and distribution of expression.